Patent GB-430820-A (GB)
Title: Improvements in or relating to machines for levelling and surfacing roads or other surfaces
Inventor: TEED GEOFFREY WILMOT
IPC: E01C19/26
Filed: 1934-10-13
Abstract: 430,820. Road rollers; levelling and surfacing roads &c. TEED, G. W., and TEED, D. T., (Representatives of TEED, H. W.), Spindrift, Keston, Kent. Oct. 13, 1934, No. 25392/33. [Class 6 (i)] [See also Group X] In a levelling and surfacing machine of the kind described in Specification 230,131, [Class 6 (i)], wherein a levelling device is mounted between wheels or rollers or sets of wheels or rollers in such a manner as to be adjustable longitudinally of the machine, means are provided for driving a rolling levelling-device and some or all of the wheels or rollers at both ends of the machine and for steering them all simultaneously in such a manner that those at one end of the machine are moved in the opposite angular direction to those at the other end. The levelling-device shown consists of a roller 8 mounted on a slide movable by means of a lever 9. The machine comprises a platform 1 mounted on two end bogies 3 pivoted on horizontal axes 7 and both carrying two rollers 4, 5 movable about vertical axes 6. The members 15 carrying the rollers 5 are connected to those carrying the rollers 4 by inclined links arranged so that the rollers 5 turn through a greater angle than the rollers 4 when steering is effected by turning a hand wheel 18, which drives a pinion engaging between two racks connected to steering rods 19. The rollers 4, 8 are driven by chain gearing from a main shaft 24, the rollers 4 through intermediate shafts 37a, 52, and 38<a>, 53, respectively, and the roller 8 through intermediate shaft 36. Shafts 37a, 38a are driven through flexible couplings which allow them to turn about vertical pivots when the rollers 4 are steered, so avoiding undue torsion in the chains. Adjustable rods 64, 65 between the shafts 37<a>, 52 and 38a, 53 and adjustable connections 62, 63 between the roller spindles 60, 61 and the shafts 52, 53 allow of floating movement of the shafts 52, 53 and adjustment of the tension of the driving chains. Similar rods 71 and connections 70 movably support the shaft 36 driving the roller 8. The members carrying the shafts 37a, 38a are connected to the members carrying the rollers 4 by pins and curved slots 76 so that rocking of the bogies 3 about the axes 7 does not tend to turn the shafts 37a, 38a about vertical axes. The shaft 24 may be driven by hand or power or may serve to transmit motion from one roller to another. The roller 8 is longer than the rollers 4, 5 so that the extreme edges of a roadway may be rolled without the steering being interfered with by the kerb. The rollers 4 may also be longer than the rollers 5, and the pivotal axes 7 may be nearer the rollers 4 than the rollers 5. Instead of chain gearing, bevel gearing, telescopic shafts, and universal joints may be used. Arrangements may be made for moving weights, or the driver's seat, or otherwise automatically adjusting the centre of gravity of the machine when the levelling device is adjusted. The movement of the driver's seat may be variable for drivers of different weights. For travelling purposes supplementary wheels of larger diameter than the rollers may be mounted on two of the axles. These wheels may be provided with rubber tyres and with springs. When a tamping or other levelling device is used instead of the roller 8 it may project laterally beyond the rollers 4, 5.